A Department of Homeland Security spokeswoman told Business Insider that the design is the same that has been used in Calexico:

Construction of a new fence takes place as U.S. Department of Homeland Security Secretary Kirstjen M. Nielsen tours a replacement border fence construction site on April 18, 2018 in Calexico, California. Getty Images/David McNew

The fencing in Calexico, however, doesn’t appear to feature the same sharply spiked tips as the design Trump tweeted.

The Trump administration has also been working on similar fencing projects throughout the last year, using “bollards” — spaced-out, hollow steel rods — as a barrier, usually with metal anti-climbing plates at the top.

Critics took to social media on Friday to mock Trump and the slat design: